Troubleshooting · How we test and maintain this guide
A format choice does not skip every earlier check
MP3 mode first retrieves and checks the available audio. If the source is already an MP3, the current tool keeps those bytes instead of encoding them again. If it is another supported format that the browser can decode, the tool converts the decoded samples to MP3. Original mode keeps the available source bytes after the shared checks.
This distinction matters when an error occurs. A failure while fetching, identifying or decoding audio happens before the additional MP3 encoder. Selecting Original may help an encoder-specific failure, but it cannot make an unavailable source accessible or make the browser accept an encoding it cannot decode. Read the exact message beside the row.
Three cases with different meanings
| Observed case | Result |
|---|---|
| Existing MP3 inputs in the ten-signal test | Both remained byte-identical in MP3 mode |
| Eight non-MP3 inputs in that test | Converted through the 192 kbps MP3 encoder |
| Deliberately failed encoder worker | Preparation rejected with an MP3 encoding error |
The encoder-failure case intentionally made the worker fail; it is not a report of a production outage. The two existing MP3 signals used a different source bitrate from the conversion setting and still passed through unchanged. Consequently, the MP3 option does not promise that every result has the same bitrate or that it has been newly encoded.
See the ten-sample comparison for actual sizes, duration differences and full-decode checks. The samples are generated test signals supplied locally, so their preparation times do not describe Suno network speed. Their role is to show the output rules under a controlled setup.
Recover a usable file with a small test
- Keep the workspace open and save other ready files before changing the run.
- Confirm whether the message mentions decoding, encoding, transfer or access. Use the audio-check guide for a failure before encoding.
- For an encoder-specific failure, try one permitted song with Original and check whether your target player supports the returned file.
- If the target requires MP3, test a single conversion in a current compatible browser with adequate free memory before retrying a batch.
- Open the actual saved result and listen to representative passages. Do not stop at a successful button state.
Changing the format and retrying failed items can leave a collection containing earlier successful outputs and newly prepared outputs. Check each row's extension and record rather than assuming the whole list has been regenerated. If you need every file prepared under one consistent choice, save existing work, then start a deliberate fresh run with that choice.
If you use a separate converter after saving Original, retain the original file and label the converted copy. That later conversion is outside TuneBundle's exported record: its byte size, hash and possibly duration will differ from the original CSV values. A new extension typed into a filename is not a conversion.
A larger MP3 is not automatically an improvement
Converting a low-bitrate compressed source to a higher nominal bitrate can produce a larger file without recovering missing detail. An uncompressed source can produce a much smaller MP3. The outcome depends on the source, duration and encoding choices, so compare actual files rather than treating size alone as a quality score.
For a rough calculation, 192,000 bits per second over 120 seconds is 2,880,000 bytes before container overhead. That is about 2.75 MiB. This is an arithmetic estimate, not a guarantee of the downloaded size; an already-MP3 source can follow its own bitrate, and headers or tags add bytes. The measured table is more useful when you need to understand a particular output.
Original also does not promise an official lossless master or stems. Use the source service's own available export when your project requires a specific official format. Keep the chosen format connected to the destination's actual needs: preview, local playback, an editor or an archive may favour different copies of the same permitted work.